Cylinder block ridge grinder



l eb. 13, 1951 E. F. FROST 2,541,412

CYLINDER BLOCK RIDGE GRINDER I Filed Oct. 25, 1948 2 Sheets-Sheet l Fig.

Edward F. Frost INVENTOR.

Feb. 13, 1951 v E. F. FROST 2,54

CYLINDER BLOCK RIDGE GRINDER Filed Oct. 25, 1948 2 Sheets-Sheet 2 5Edward F. Fros/ INVENTOR' BY Qmaoifiw WWW a @M Patented Feb. 13, 1951UNITED STAT ES PATENT OFF I 2,541,412

CYLINDER BLOCK RIDGE GRINDER EdwardF. Frost, Le Sueur, Minn;

Application October 25, 1948; Serial'No.'56,288"

2Glaims. I This invention relates to a device for dressing the innersurface of a cylinder and has for itsprimary object to efiiciently andconveniently remove the ridge from the top of worn cylinder blocks andtoform a bevel on the top of the cylinder after removing the ridge sothat new rings may be easily inserted and subsequent ring breakage andring knocks will be obviated.

Another important object of this invention is to provide a cylinderridge grinderhaving' adjustable means for holding the grinderinthedesired, correctly aligned position in a cylinder;

Another object of this invention is to provide means whereby thegrinding wheels may be ad justed laterally inthe cylinder relative totheretaining means and the operating means.

And yet another important object ofthisinvention is to provide meanswhereby the grinding wheel-and appurtenant driving parts may bemovedaround in an orbit to carry out the grinding of the bore of acylinder and to remove the ridge from the top of the block.

These and ancillary objects and other meritorious features are attainedby this invention, a preferred-embodiment ofwhich is set" forth in thefollowing description and illustrated in the accompanying drawings,wherein:

Figure 1 is a front elevationalv-iew of this'invention, showing the samein operation for removing the ridge from the top of the cylinder bore;

Figure 2 is a side elevational view of this invention;

Figure 3 is a top plan View ofthis invention;

Figure-4 is a cross sectional. view taken on line i'--4' of Figure 2;

Figure 5 is a verticalsectional view, showing the upper portion of theinstantv invention in elevation;

Figure 6 is a cross sectional view taken. online 5-6 of Figure 5;

Figure '7 in an enlarged fragmentary View of a modified form of grindingwheel, and,

Figure 8 is a sectional view through the superimposed adjusting gearsfor securing the upper and lower pair of centering jaws in the cylinderto-operatively position the grinding wheel there- In carrying out thisinvention, generally designated by the character reference In, there isprovided a casting [2 upon which. is mounted a conventional electricmotor I4. A driving shaft I6 extends downwardly from the motor and acooling fan 18 is fixed thereon by means of a securing collar 26. Thedriving shaft extends vertically through the casting or housing l2. Amiter gear 22 is fixed on the depending end of 2. the shaft and a ballbearing assembly24 is disposed on'the shaft-behind the gear.

A complementary miter gear 26 is disposed at right angles in meshingengagement with the gear 22 and is fixed on a transverse shaft 28. Theshaft 28 is preferably square or hexagon in. cross section complementarytothe cross sectional shapeof the opening in the gear '26" and thecollar 3% therefor so that the shaft can he slid in and out of the gearfor adjustment purposes, as will be later described. Of course, aconventional ball bearing assembly 32 is disposed on the shaft inengagement with the collar 38, as seen'in Figure 5. A- miter gear 34 is"disposed on one end of the drivesha'ft 23=and acomplementary miter gear36 is disposed at a-right'angle inmeshing engagement with the gear. Thegear 36 is disposed on a chuck shaft 38 which"- is vertically androtatably disposed in acasing All, having a lateral flang -42 whichisbolted as at 44 to the-casing 46 for the drive shaftZB. Of course,ball bearing assemblies 48 and 50 are disposed at the upper and lowerend of the chuck shaft, the shaft terminating upwardly in a knurled knob52; complementary in use to the hand tightening chuck 54 within which isheld a'cylindrical grinding wheel 56; Thus, to remove thegrinding wheelortoinsert a grinding wheel in the chuck, the knurled-kno'b-B'Iis heldand the chuckis rotated to open or close the jaws" of the same;

To adapt the grinding wheel 56 for'use. with various sized cylinderbores, means is provided for moving the same laterally with respect tothe housing 12. In this respect, the drive shaft- 28 is di'spos'edtransversely in-the reduced lower end of the housing on which the casing46v is slidably disposed. Theicasing includes parallel side members 58and stl wh'ich are slidably. disposed in opposed channels or'guideways.on the reducedlower end of the housing. One of the ends of thebars issecured to abar'support and bushing 62.

Means is. provided for moving. the. casing, inwardly and outwardly withrespe'ct to the housing I2 and comprises a shaft 64 which is rotatablybut securely. attached atone end:to the flanged end: of the casing,theshank of the shaft being externally threaded and disposed through atransverse bore in the reduced portion of the housing 12. The oppositeend of the shaft is rotatably mounted in a flange 66. Means is providedfor actuating the shaft 64 laterally in the-housing to move the housing4i! inwardly and outwardly relative to the: housing, I2 and preferably.-includes a worm gear- 10 having a threaded bore in which is received thethreaded shaft 64. The worm gear acts as a feed nut for the feed screw64. The worm 68' meshes with the worm gear and is secured at itsopposite end to an operating rod 'II, the operating rod terminating in aconventional universal joint connection 12 which is affixed to a shaftupon which the worm is mounted. The rod H is bracketed by means of abracket I4 and a bracket I6 to the side of the housing I2. The rodterminates in a knurled wheel 18, to which manual rotation can beapplied for rotating the rod 7| and impart ing rotation to the worm 68and correspondingly moving the shaft 64, lateral movement of the shaftproducing a lateral movement of the bars 58 and 60 and correspondingly amovement of the casing 48 for the chuck shaft 38.

The housing I2 is rotatably disposed on a supporting member 80, thesupporting member having means for engaging the bore of a cylinder or alike work piece. In this respect, the housing I2 and more particularlythe reduced portion thereof terminates in a centrally apertured head 82.The supporting member or casting B is provided with an upraised taperedspindle 84, the same being rotatably disposed in the central aperture inthe head 82. A set screw 86 is provided for selectively preventing andpermitting rotation of the spindle 84 relative to the head 82. A handwheel 88 is formed on the upper end of the housing I2 so that movementof the hand wheel moves the housing I2 about the spindle 84 and producesan orbit movement of the grinding stone 56, the same being rotatedthrough the drive shaft 28 and the armature shaft I6 of the motor.

Means is provided for retaining the supporting member 80 within the bore96 of a conventional cylinder 92 and comprises an upper set of.retaining jaws or arms 94 and a lower set 96. A sectional shaft 98 isvertically disposed in the center of the supporting member 88 and hassecured on its opposite end a pair of operating gears or gear plates I08and I82. The operating gears upon being rotated rotate the shaft 98 andthe plates I86 and I82 attached thereto. The plates are provided withspiral grooves engaging cooperating teeth on the jaws to move thecentering jaws 9 and 96 inwardly and outwardly with respect to thecasting or supporting member 88. In this respect, a pair of diagonallyplaced operating shafts I04 and I66 extend into the casting 80 and areprovided with gearends I08 and III]. The gear I68 is disposed in meshingengagement with a gear I I2 secured to the upper section of the shaft98, while the gear I I6 is in meshing engage- I ment with a gear I I4secured to the lower section of the shaft. Thus, rotation of theactuating shaft I64 will rotate the gear H2 and the upper section of theshaft 98 and accordingly the operating plate I62 will actuate the upperset 94 of centering jaws. In a similar manner, rotation of the operatingrod I66 will rotate the gear [I4 and the operating plate I 86 to movethe lower set of jaws inwardly and outwardly.

The operating rods I64 and I86 are formed at their upper ends withsquare heads H6 complementary to a socket wrench II8 for rotating thesame. 7

Means is provided for conducting a supply of electrical energy to theelectric motor from a suitable supply source and includes an electricalconductor I I8 which is connected to commutator brushes I28 carried by abrush ring I22. Slip rings I24 and I26 are disposed in wiping contactwith the brushes, so that as the casting I2 is rotated on the supportingmember by the hand wheel 88, the slip rings I24 and I26 are rotatedwithin the brushes of the brush ring, the same being stationary, so thatthe conductor H8 is prevented from being tangled.

Attention is now directed to Figure 7, wherein there is illustrated themeans provided for beveling the top of the cylinder after removing theridge, as shown in Figure 5. In this respect, a grinding stone I28 isprovided, the same including a tapered or conical body section I30 andan annular reduced end I32 and an upper disk-like end I34. It can thusbe seen that when the conical intermediate section or tapered sectionI30 engages the top of the cylinder, it, as it rotates, imparts a bevelto the same. Another form of grinding wheel is illustrated in Figure 8,wherein the same includes complementary superimposed tapered wheels I86and I38.

Thus, it can be seen that there is provided a novel and improvedgrinder, which is adapted for removing the ridge from the top of worncylinder blocks. However, it is to be understood that the same can beemployed effectively and dependably in grinding various other workpieces and in various other operations, wherein another tool could besubstituted for the grinding stones 58 and I28. Accordingly, it is to beunderstood that while only one embodiment of this invention has beendiscl osed, that other embodiments and changes in details of structuremay be carried out, the same coming within the spirit of the inventionand the scope of the appended claims.

Having described the invention, what is claimed as new is:

l. A grinding device comprising: a supporting member adapted to beinserted in the work piece, said supporting member having a sectionalshaft journalled therein, gearing means mounted in said supportingmember for rotating said shaft, a plurality of plates on said shaft androtatable therewith, said plates being provided with spiral grooves,jaws mounted in said member having teeth cooperating with said platesand being laterally reciprocated thereby, said jaws being engageablewith the walls of the work piece for support, a housing rotatablymounted on said supporting member, a tool rotatably carried by saidhousing and laterally movable thereof, and actuating means mounted onsaid housing for rotating said housing and tool for moving said tool inan orbit about said housing.

2. A grinding device comprising: a supporting member adapted to beinserted in the work piece, said supporting member having a sectionalshaft journalled therein, gearing means mounted in said supportingmember for rotating said shaft, a plurality of plates on said shaft androtatable therewith, said plates being provided with spiral grooves,jaws mounted in said member having teeth cooperating with said platesand being laterally reciprocated thereby, said jaws being engageablewith the walls of the work piece for support, a housing rotatablymounted on said supporting member, a tool rotatably carried by saidhousing and laterally movable thereof, and actuating means mounted onsaid housing for rotating said housing and tool for moving said tool inan orbit about said housing, rotating means mounted within said housingand for driving said tool and the grinding wheel thereon for grindingthe work piece.

EDWARD F. FROST.

(References on following page) REFERENCES CITED The follbw ingreferences are of record in the file of thief patent:

UNITED STATES PATENTS Number Name Date 1,927,898 Myers Sept. 26, 19332,016,574 Myers Oct. 8, 1935 2,295,516 Hoelscher Sept. 8, 1942 NumberNumber Name Date Rohrdanz Sept. 29, 1942 Berezny Dec. 5, 1944 FOREIGNPATENTS Country Date Germany Aug. 1, 1921 Great Britain Apr. 27, 1933

